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Sixteen ohm drivers (or loudspeakers systems) would be connected to the 16-ohm tap, 8 ohm to the 8 ohm tap, etc. This is significant since the ratio between the loudspeaker impedance and the amplifier's impedance at a particular frequency provides damping (i.e., energy absorption) for the back EMF generated by a driver.
American EIA standard RS-299A specifies that (or DCR) should be at least 80% of the rated driver impedance, so an 8-ohm rated driver should have a DC resistance of at least 6.4 ohms, and a 4-ohm unit should measure 3.2 ohms minimum. This standard is voluntary, and many 8-ohm drivers have resistances of ≈5.5 ohms, and proportionally lower for ...
The Concert Grand was the crown jewel of Bozak speaker systems since its introduction in 1951. [6] This refrigerator-sized speaker system originally contained four B-199 12" woofers, one 8 Ohm B-209 6" midrange driver and eight tweeters. [7]
A horn-loaded speaker can have a sensitivity as high as 110 dB at 2.83 volts (1 watt at 8 ohms) at 1 meter. This is a hundredfold increase in output compared to a speaker rated at 90 dB sensitivity and is invaluable in applications where high sound levels are required or amplifier power is limited.
An external speaker jack is located next to the output tubes in the back and allows the signal to be heard out of both the amplifier itself and the speakers to which it is connected (which must have a 4- or 8-Ohm impedance). The DeVille features a 60-watt valve amplifier with three 12AX7 preamp valves and two 6L6 output valves. Its circuitry ...
Such loads are around 1/1000 the impedance a line out is designed to drive, so the line out is usually not designed to source the current that would be drawn by a 4 to 8 ohm load at normal line out signal voltages. The result will be very weak sound from the speaker and possibly a damaged line out circuit.
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These speakers introduced the concept of a small box/long excursion woofer designs for car audio. The CS-1 series was also introduced, JL Audio's first component speaker introduction. In 1993, the W6-series subwoofer drivers are introduced in 8, 10, 12 and 15-inch sizes. This product was considered unique for its dual 6-ohm voice coil system ...
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